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31. 发明专利

JP2002244355A TWO-COMPONENT DEVELOPER 失效
公开(公告)号：JP2002244355A
公开(公告)日：2002-08-30
申请号：JP2001036115
申请日：2001-02-13
申请人： RICOH KK
发明人： YAGI SHINICHIRO , YAMAGUCHI KIMITOSHI , MOCHIZUKI MASARU , NAKAI HIROSHI , MASUDA MINORU
IPC分类号： G03G9/08 , G03G9/107 , G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide two-component developers of a small grain size which meets the requirements for higher fineness and higher image quality, has good conveyability within a developing device and is capable of forming toner images having definition, gradation characteristic, fine line reproducibility free of carrier adhesion. SOLUTION: The two-component developers containing polymerization process toners externally added with at least silica particulates and titanium oxide particulates and carries are characterized in that (a) the toners have an average grain size of 4 to 8 μm; (b) the carriers are the coated carriers formed by coating the particle surfaces of spherical composite core particles of 10 to 50 μm in average grain size formed by bonding hard magnetic particle powder and soft magnetic particle powder with a phenolic resin as a binder by using a silicone resin containing a coupling agent; (c) the coated carrier have a shape coefficient SF-1 of 100 to 130; (d) the coated carrier have saturation magnetization of 50 to 90 emu/g in 3 kiloersted; and (g) the fluidity of the developers is 30 to 50 (second/50 g). There are other two items.

32. 发明专利

JP2002207304A IMAGE FORMING METHOD 失效
公开(公告)号：JP2002207304A
公开(公告)日：2002-07-26
申请号：JP2001003256
申请日：2001-01-11
申请人： RICOH KK
发明人： YAGI SHINICHIRO , AOKI MITSUO , SASAKI FUMIHIRO , IWAMOTO YASUTAKA , MATSUDA HIROAKI , SHIMODA NAOTO , NAKAI HIROSHI , YAZAKI KAZUYUKI , HASEGAWA HISAMI , HIGUCHI HIROTO , SUGIYAMA AKIYOSHI
IPC分类号： G03G9/08 , G03G5/05 , G03G9/10 , G03G15/09 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To obtain an image forming method by which the wear amount of the photoreceptor surface due to friction by a carrier deposited is decreased even when a toner and a carrier with smaller particle sizes are used and by which images are free from scratches or decrease in the density even for long- term use. SOLUTION: The image forming method is carried out by incorporating silicone oil into the surface layer of the photoreceptor, by forming an electrostatic latent image on the photoreceptor by using electrifying and exposing means and then by developing the image by using a two-component developer consisting of a nonmagnetic toner and a magnetic carrier. When the weight average particle size of the toner and the weight average particle size of the carrier are 5 to 10 μm and 15 to 45 μm, respectively, the frictional coefficient A of the surface of the photoreceptor and the dynamic frictional coefficient B of the magnetic brush are controlled to satisfy the relation of A/2+B

33. 发明专利

JP2001022103A ELECTROPHOTOGRAPHIC PHOTORECEPTOR AND ITS PRODUCTION 失效
公开(公告)号：JP2001022103A
公开(公告)日：2001-01-26
申请号：JP19341899
申请日：1999-07-07
申请人： RICOH KK
发明人： NAKAI HIROSHI , MIYAZAKI KUNIHIKO
IPC分类号： G03G5/05
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of unevenness in tint by thoroughly pulling up a drum from a coating fluid for an electric charge generating layer and keeping the drum stationary for specified seconds when the electric charge generating layer is formed by dip coating. SOLUTION: A drum 2 is held by an elevator 1 and soaked in a coating fluid 4 for an electric charge generating layer filled into a coating tank 3. The entire drum 2 is soaked and the drum 2 is pulled up at a prescribed rate to stick the coating fluid on the drum 2. After the drum 2 is thoroughly pulled up from the coating fluid 4, it is kept stationary for >=T/2 sec, preferably T/2 to T sec (T is the boiling point of a solvent contained in the coating fluid 4) to form the electric charge generating layer of the objective electrophotographic photoreceptor. The drum as an electrically conductive substrate may be a film of a metal such as Al, Ni, Fe, Cu or Au or an alloy. The solvent may be tetrahydrofuran having 65 deg.C boiling point, dichloroethane having 84 deg.C boiling point and cyclohexane having 81 deg.C boiling point.

34. 发明专利

JPH10293409A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH10293409A
公开(公告)日：1998-11-04
申请号：JP10175597
申请日：1997-04-18
申请人： RICOH KK
发明人： SUZUKI YASUO , IKEGAMI TAKAAKI , TAMOTO NOZOMI , NAKAI HIROSHI , KISHIDA KOJI
IPC分类号： G03G5/00 , G03G5/05 , G03G5/147
摘要： PROBLEM TO BE SOLVED: To provide the electrophotographic photoreceptor free from rise of residual potential at the time of repeated uses, high in transfer efficiency, improved in clenanbility, and high in durability by using a combination of specified 2 kinds of polysiloxanes in the outermost layer. SOLUTION: The electrophotographic photoreceptor is provided on a conductive substrate with a photosensitive layer and and the outermost layer of the photoreceptor containing a mixture of a vinyl-modified polysiloxane and an alkoxy-modified polysiloxane, or a mixture of a vinyl-modified polysiloxane and a polysiloxane modified with a different functional group, or a mixture of a vinyl-modified polysiloxane and a fluorinated polysiloxane, and a polysiloxane alone of even one of this mixture has a high efficiency and a high retainable cleanability an effect for lowering surface energy, and using the mixture of both exhibits a synergistic effect. It is preferred that this mixture of the polysiloxane are used in an amount of 0.5-10 weight % of the binder resin in the outermost layer.

35. 发明专利

JP2003149850A DEVELOPING METHOD AND DEVELOPING DEVICE 审中-公开
公开(公告)号：JP2003149850A
公开(公告)日：2003-05-21
申请号：JP2001342966
申请日：2001-11-08
申请人： RICOH KK
发明人： NAKAI HIROSHI , ICHIKAWA TOMOYUKI
IPC分类号： G03G9/08 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing method by which a stable image free from surface staining is outputted even when copying processing is repeated over a long term or even when a special using state where toner consumption is low extends over a long time in a compact developing device, and to provide the developing device. SOLUTION: In this developing method, toner is supplied from a toner replenishing part 6 to a developer stirring part 3, the supplied toner and developer are mixed by using stirring members 2a and 2b in the stirring part 3, and the toner is electrified, and carried and fed by a developer carrier 1, so that an electrostatic latent image formed on a latent image carrier is developed as a visible image. In the method, the relationship between a weakly electrified and/or reversely electrified toner component amount p1 (%) in the toner electrification amount distribution at the entrance 4 of the developer stirring part and a weakly electrified and/or reversely electrified toner component amount p2 (%) in the toner electrification amount distribution at the exit 5 of the developing stirring part is set to (p1-p2)/p1>=0.20.

36. 发明专利

JP2002278127A ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2002278127A
公开(公告)日：2002-09-27
申请号：JP2001078764
申请日：2001-03-19
申请人： RICOH KK
发明人： IWAMOTO YASUTAKA , SASAKI FUMIHIRO , MATSUDA HIROAKI , NAKAI HIROSHI , HIGUCHI HIROTO , SHU HIYO , KONDO MAIKO
IPC分类号： G03G15/02 , G03G9/08 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide an image forming method and toner by which the soiling of a contact electrifying roller by the toner is restrained in an image forming method by a contact electrifying system. SOLUTION: The distribution of the grain size of toner particles is set so that the toner particles whose grain size is

37. 发明专利

JP2002268240A IMAGE FORMING DEVICE AND IMAGE FORMING METHOD 失效
公开(公告)号：JP2002268240A
公开(公告)日：2002-09-18
申请号：JP2001067265
申请日：2001-03-09
申请人： RICOH KK
发明人： NAKAI HIROSHI , SUGIURA HIDEKI , SASAKI FUMIHIRO , IWAMOTO YASUTAKA , HIGUCHI HIROTO
IPC分类号： G03G9/08 , G03G5/04
摘要： PROBLEM TO BE SOLVED: To provide an image forming device free from filming of toner on the surface of a photoreceptor while preventing the depletion of the surface of the photoreceptor and hardly spoiling the surface of the photoreceptor even in the case of removing the filming of the toner by cleaning when the filming thereof is caused, and preventing the photoreceptor from being damaged and having high image quality, and to provide an image forming method. SOLUTION: This image forming device is provided with a removing stage for removing the toner remaining on the photoreceptor after an electrostatic latent image on the photoreceptor is developed with the toner constituted by adding an additive consisting of inorganic particulates to base particles comprizing at least binding resin and a colorant. The developed toner image is transferred to recording material. The additive of the toner consists of at least two kinds of inorganic particulates and the ratio of the abrasion loss of the surface layer of the photoreceptor to the driving distance of the surface of the photoreceptor is .

38. 发明专利

JP2002258532A TONER, ELECTROPHOTOGRAPHIC PHOTORECEPTOR AND IMAGE FORMING METHOD 失效
公开(公告)号：JP2002258532A
公开(公告)日：2002-09-11
申请号：JP2001059097
申请日：2001-03-02
申请人： RICOH KK
发明人： IWAMOTO YASUTAKA , SUGIURA HIDEKI , SASAKI FUMIHIRO , NAKAI HIROSHI , HIGUCHI HIROTO
IPC分类号： G03G9/087 , G03G5/047 , G03G5/05 , G03G15/08 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To provide toners which do not give rise to filming and damaging of a photoreceptor surface, extremely lessen the wear of the photoreceptor surface and make it possible to obtain high-quality images, an electrophotographic photoreceptor and an image forming method. SOLUTION: The toners characterized in that the measurement difference by gas chromatography between the amount of the residual monomers derived from manufacturing of binder resins and the amount of the residual monomers before heating when the toners containing the binder resins are heated to 50 to 200 deg.C is

39. 发明专利

JP2002229247A IMAGE FORMING METHOD 失效
公开(公告)号：JP2002229247A
公开(公告)日：2002-08-14
申请号：JP2001029864
申请日：2001-02-06
申请人： RICOH KK
发明人： SUGIYAMA AKIYOSHI , IWAMOTO YASUTAKA , NAKAI HIROSHI
IPC分类号： G03G9/08 , G03G5/05 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To obtain a toner which has stable electrostatic property all the time and assures formation of a sharp image and to obtain an image forming method by an electrophotographic photoreceptor, in an image forming method that reuses untransferred toner remaining on a latent image carrier after development and transfer. SOLUTION: In the image forming method for forming toner image by developing a latent image on the latent image carrier, the toner used for the development of the electrostatic latent image is such that the amount of toner particles having a size equal to or smaller than 5 μm is 15 number % or less, the amount of toner particles having a diameter that is equal to or tow times greater than a weight average particle diameter is 5 volume % or less, the relationship between number average particle diameters D25 and D75 corresponding to 25% and 75%, respectively, in cumulative number distribution is 0.60

40. 发明专利

JP2002196530A TWO-COMPONENT DEVELOPER AND IMAGE FORMING DEVICE AND IMAGE FORMING METHOD EACH USING THE SAME 审中-公开
公开(公告)号：JP2002196530A
公开(公告)日：2002-07-12
申请号：JP2001273280
申请日：2001-09-10
申请人： RICOH KK
发明人： SASAKI FUMIHIRO , IWAMOTO YASUTAKA , MATSUDA HIROAKI , NAKAI HIROSHI , HIGUCHI HIROTO , SHU HIYO , KONDO MAIKO
IPC分类号： G03G9/083 , G03G9/09 , G03G9/107 , G03G9/113 , G03G15/08 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To provide a two-component developer which satisfactorily imparts electric charges to a toner and gives a good image free from a scattered toner, surface stain and streaky stain and to provide an image forming device and an image forming method each using the developer. SOLUTION: The two-component developer contains at least a magnetic toner (A) having a magnetic material which is magnetic particles obtained by bonding carbon black to the surfaces of magnetic particles and a magnetic carrier (B).

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